Quote Originally Posted by Pinski1 View Post
Unfortunately the pack is now gone into the waste disposal bin in the sky. It's a painful lesson which should help me remember to avoid it in the future. How do others manage this? Do you guys have under voltage lockouts? Keep a battery monitor permanently attached?
Some ESC's have built in voltage cut outs, usually at 3V or 3.2V depending on the original intended application, so the Castle Creations ESC's we have in Conker and Binky will cut out if the total voltage drops below 3.2V per cell.

However, note I said TOTAL voltage. We had 2 packs, one was fine, the other undervolted. Between the two of them, they exceeded the 32V cut off point for a 10S pack even though one pack was way down and the other way way up. There is no real way around this when using 2 packs that is simple to implement (that I am aware of).

Single cell machines can have one of these installed: https://www.dimensionengineering.com...cts/cellshield But it can only be linked to one of the ESC's as its meant for Cars, Helicopters and Planes that only have 1 drive motor. You could put it on your arm's esc so when the arm stops working you know you are on the limit and can just tap out to save the robot.

Aside from that, baring telemetry, there isn't really any way to tell, until your robot goes all sluggish, which is usually to late. Over the events we have done you get an idea of how much power you are using. If you keep track of fight times and then note how much power is put into the battery when its recharged you can work out how much you need.

As an example, if you have a 3 minute fight and use 1200mAh, a 2 min fight and use 1000mAh and a 1 min fight and use 450mAh then you know you are using between 400mAh and 500mAh per minute. So if you are having 3 min fights that's 1500mAh, taking the worst case scenario, but you also need a safety margin so a 1800mAh pack would do. I hope that makes sense!